var MongoClient = require('mongodb').MongoClient, format = require('util').format;
MongoClient.connect('mongodb://127.0.0.1:27017/test', function(err, db) {
	if (err) {
		throw err;
	} else {
		console.log("successfully connected to the database");
		var collection = db.collection('test_insert');
	    collection.insert({a:2}, function(err, docs) {
	        collection.count(function(err, count) {
	            console.log(format("count = %s", count));
	        });
	    });

	    // Locate all the entries using find
	    collection.find().toArray(function(err, results) {
	        console.dir(results);
	        // Let's close the db
	        db.close();
	    });
	}
	db.close();
});